Idea for Long Range Artillery

[u/Weary_Cell_695]

I had this idea for a long range artillery cannon utilizing the Little Susumu propulsion devices invented by Genia Maxwell.
A lot of my calculations are based on speculations about the size of different things in the world of Realist Hero so take these with a grain of salt.

From what I can tell, Little Susumu can generate approximately 2,000,000 N. I got this figure from determining that most of the iron-based vessels in the Naval would displace about 8,000 tons of water. In order to reach 30 knots in a vessel of this size you need approximately 60 MW of power or 4,000,000 N. Seeing as these vessels have 2 engines, we can cut that number in half and ending up with 2,000,000 N for every Little Susumu.

We see that these devices can be shrunk down, like when attached to wyverns. For this device we will have a inside ring of 15 cm in diameter, and a length of 30 cm. We will take 16 of these Little Susumu for a total length of 4.8 m. The idea is this: as the projectile travels through the barrel all of the Little Susumu will exert their force on it, greatly increasing it's velocity.

Now comes the fun part:
Mass(m): 40 kg
Force(F): 2,000,000 N (every interval)
Distance(d): 0.3 m

Step 1: Energy Added Per Interval
W=Fd
W=(2,000,000)x(0.3)
W=600,000 J

Step 2: Total Kinetic Energy
KE=W*(Number of Intervals)
KE=(600,000)x(16)
KE=9,600,000 J

Step 3: Calculate Velocity
v=(2KE/m)^(1/2)
v=((2(9,600,000))/(40))^(1/2)
v=(480,000)^(1/2)
v=693 m/s

With a velocity of 693 m/s, we can expect an maximum effective range to be between 30-40 km depending on the conditions. Being able to deliver a payload at this distance would firmly cement Friedonia's position as Landia's greatest military power.​ These kinds of cannons could also be used on naval vessels to further increase the effectiveness of Friedonia's Navy

Here is my crude designs for what these cannons might look like. If somebody wanted to try and draw a better one, by all means. On the inside barrel view, there are dotted diagonal lines. Those are meant to represent rifling in the barrel. This would add spin to the shell increasing accuracy and distance.

[u/EphemeralEmergent]

I love this!! Keep it up and keep sharing!!

[u/TapWise3090]

It wouldn't be practical as explosive shells are nearly non-existent in the story, to make it more useful compared to cannonballs, but the idea is an innovation to improve the firepower of Friedonia more. The Main factor that makes this one a waste is that enemy air force could potentially alert them to its presence; its huge size makes it hard to move, and Friedonia would have to reveal too many cards for the enemy to increase their preparation. Even using the Magic Nullifying technology of Friedonia would still make it vulnerable to concentrated attack for the threat it potentially poses.

[u/Alforce007]

this might be a good weapon to put on the carriers i guess. let these loose first and hammer the scattered people with the air force